Thermally Triggered Transition of Superhydrophobic Characteristics of Micro- and Nanotextured Multiscale Rough Surfaces,The Journal of Physical Chemistry C

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Thermally Triggered Transition of Superhydrophobic Characteristics of Micro- and Nanotextured Multiscale Rough Surfaces
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2015-06-10 00:00:00 , DOI: 10.1021/acs.jpcc.5b02917
Bichitra Nanda Sahoo ₁ , Kandasubramanian Balasubramanian ₁ , Mahesh Sucheendran ₁

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In this paper, the superhydrophobicity of multiscale hierarchical structures and wettability transition phenomenon of a water droplet on the superhydrophobic surface at different substrate temperatures are extensively studied. Spin-coating and spray-coating methods have been regulated to fabricate EPF (expanded polystyrene foam)/candle soot and EPF/camphor soot particle composite films. A maximum water contact angle of 165° and a roll-off angle of 2° were obtained with spray-coated EPF/camphor soot composites, which demonstrates their superhydrophobicity. By the measurement of the water contact angle at different substrate temperatures, we have demonstrated the influence of heat energy and pressure developed by micro water droplets during the spreading phase. The reduction in water repellence observed on the protrusion-induced hierarchical nanostructure is explained by the balancing pressure induced by a droplet of 4 μL volume and work of adhesion. The droplet contact area of hierarchical surfaces was profoundly influenced by the change in viscosity of the water droplets with temperature. The best performing spray-coated EPF/camphor soot particle composite film impressively maintained superhydrophobicity with a critical pressure of 200 Pa. The resulting insights can be used to tailor the wettability of composite films and control liquid flow patterns for engineering applications such as microfluidics and biosensing devices.

中文翻译：

热触发的微米级和纳米级多尺度粗糙表面超疏水特性的转变

本文研究了不同尺度下多尺度层次结构的超疏水性和水滴在超疏水性表面上的润湿性转变现象。已经调节了旋涂和喷涂方法以制造EPF（膨胀聚苯乙烯泡沫）/蜡烛烟灰和EPF /樟脑烟灰颗粒复合膜。喷涂EPF /樟脑灰复合材料的最大水接触角为165°，滚落角为2°，证明了它们的超疏水性。通过测量不同基材温度下的水接触角，我们证明了在铺展阶段微水滴产生的热能和压力的影响。通过由4μL体积的液滴引起的平衡压力和粘附功，可以解释在突起诱导的分层纳米结构上观察到的疏水性降低。水滴表面的液滴接触面积受到水滴粘度随温度变化的深刻影响。最佳性能的喷涂EPF /樟脑灰颗粒复合膜可在200 Pa的临界压力下令人印象深刻地保持超疏水性。所得的见解可用于定制复合膜的润湿性并控制液体流型，以用于微流体和生物传感等工程应用设备。水滴表面的液滴接触面积受到水滴粘度随温度变化的深刻影响。最佳性能的喷涂EPF /樟脑灰颗粒复合膜可在200 Pa的临界压力下令人印象深刻地保持超疏水性。所得的见解可用于定制复合膜的润湿性并控制液体流型，以用于微流体和生物传感等工程应用设备。水滴表面的液滴接触面积受到水滴粘度随温度变化的深刻影响。最佳性能的喷涂EPF /樟脑灰颗粒复合膜可在200 Pa的临界压力下令人印象深刻地保持超疏水性。所得的见解可用于定制复合膜的润湿性并控制液体流型，以用于微流体和生物传感等工程应用设备。

更新日期：2015-06-10

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